| 主权项 |
1. An illumination device comprising:
a light output unit having an output end that outputs illumination light; an optical member that is disposed in a circumferential direction centered on a predetermined axis and that receives the illumination light from the output end and outputs the illumination light from a surface thereof; and a reflective layer that is provided adjacent to a surface of the optical member at an inner side in a radial direction and that reflects the illumination light outward in the radial direction, wherein the optical member comprises, in order from one end in a direction along the predetermined axis, a light guide layer and a diffusion layer, the light guide layer receives the illumination light from the output end in the direction along the predetermined axis and guides the illumination light, and the diffusion layer receives the illumination light from the light guide layer and guides the illumination light while diffusing the illumination light. |
